Stay-bolt for boilers.



Patented Jan-19; 1909.

J. DENE ALQ STAY BOLT FORBOILBBS. APPLICATION FILED rm. 4,

I WITNESSES:

\NVENTOR.

UNITED STAT ljl PATENT OFFICE.

.TAOKSON DENEAL, OF TOLEDO, OHIO, ASSIGNOR TO JOHN BERTHELOT, OF EASTTOLEDO, OHIO.

STAY-BOLT FOR BOILERS.

Specification of Letters Patent.

Application filed February 4, 1907.

Patented Jan. 19, 1909.

Serial No. 355,539.

To all whom it may concern:

Be it known that I, JACKSON DENEAL, a citizen of the United States,residing at Toledo, in the county of Lucas and State of Ohio, haveinvented a new and useful linprovement in Stay-B olts for Boilers, ofwhich the following is a s ecifioation.

My invention re ates to a stay bolt for boilers, and has for its objectto provide a bolt of the kind, that is readily attached and detached,and that is adapted to form tight joints in the plates of the boilerWithout being riveted, and to be removed without destroying the threadsof the plate.

I accomplish these objects by the construction and combination of partshereinafter described and illustrated in the drawings, in which Figure 1is a side view of a stay bolt constructed in accordance with myinvention, partly in longitudinal section. Fig. 2 is a similar View of amodified form of my invention.

In the drawings A represents a stay bolt constructed in accordance withmy invention, in which 1 is the tubular body portion having theeXteriorly and interiorly threaded end portions 2, which are ofincreased diameter equal to twice the depth of the exterior threads.

3 represents a pair of head bolts, each having the eXteriorly threadedbody portion 4., of a diameter and thread adapting them to be run intothe end portions of the body 1,

1 and a head 5 squared for a wrench, and having the concentric flange 6of increased diameter on the inner face of the head.

The body 1 is made of a length to extend through the boiler plates 7,which the bolt is designed to stay, with the ends flush with the outerfaces of the lates, and the plates are tapped and interior y threaded toreceive the end portions 2. After the body 1 is in position in theplates 7, the head bolts are run into the end portions, with copperwashers 8 between the head and the plates, against which the heads aretightened by a wrench until the washers are tightly compressed betweenthe concentric flanges 6 of the heads and the plates, whereby the jointsare secured against leaking.

Preferably the head bolts are each provided with a central reduced bore9, whereby in the event of the bolt becoming broken by the pressure ofthe boiler, the fact of its being broken may be detected by the escapingsteam or water.

In Fig. 2 is shown a modified form of stay bolt B, comprising a solidbody bolt 10, and the sleeve head bolts 11 having the exteriorly and theinteriorly threaded body portion 12, and the heads 13, squared for awrench and provided with the concentric flanges 1 1 on their innerfaces. The plates are tapped to receive the body portions 12 of thesleeve bolts, and the interiorly threaded bores of the sleeve bolts areof a diameter and thread to run on the body bolts 10 of the bolt B. Thesleeve bolts are also provided with copper washers 8, and when thesleeve bolts are run on the body bolt 10 and into the plates until thewashers are compressed tightly on the plates, the washers tighten andclose the joints against leakage.

The bolts A may be attached by first running into one end a head bolt 3,until the head is tight against one end of the body of the bolt, andthen threading the body of the bolt through both lates until theopposite end of the body b0 t is flush with the outer side of the secondplate and the washer 8 is compressed against the outer side of the firstplate. The other head bolt 3 is then run into the opposite end of thebody bolt, with a washer 8 between the end of the body bolt and thesecond plate, and, the two head bolts, being each held by a wrench, aretightened on the washers 8 until the joints at each end of the bolt arecompletely closed. The bolt A may be readily detached from the plates,by removing the head bolts 3 and inserting within the bore of the bolt asuitable tool for engaging the inner wall of the bolt body and runningit out of the threads of the plates.

The bolt B may be attached to the plates by first running one of thehead bolts 1 1, having a washer 8 thereon, on one end portion of thebody 10, until the inner side of the head abuts the end of the bolt. Thebolt is then inserted through one plate up to the head bolt, which isthen run into the threads of the plate, until the washer 8 is tightlycomressed against the plate. The other head liolt 10 with a washer 8thereon is then run onto the op osite end of the body 10 andsimultaneous yinto the threads of the opposite plate until the washer iscompressed on the plate, the first head bolt, the while, being heldagainst backward turning by a wrench. The

bolt B is readily detached by running the sleeve head bolts out with aWrench, the last of the head bolts to be removed carrying with it thebody bolt 10.

Stay bolts constructed as shown and described, avoid the necessity offorming rivet heads'thereon, and the skilled labor required therefor,and the detachable heads and washers provide increased support for theplates.

;- able and detachable head bolt for each end portion of the bolt body,each head bolt having a, threaded body portion of a length to extend.through the adjacent boiler plate, and adapted to threaded engagementwith the threaded end portion of the main bolt body extending throughthe plate, and a head portion adapted to be engaged by a wrench, and

,to shoulder against the boiler plate through which its body portionextends, and a duotile metal washer on the body portion of each headbolt, adapted to be compressed between the head of the head bolt and theplate through which the head bolt extends, by running the head boltsinto threaded engagement with the end portions of the main bolt body,substantially as set forth.

In witness whereof, l have hereunto signed my name in the presence oftwo subscribing witnesses, this 28th day of-January, 1907.

V JACKSON DENEAL.

In presence of W ILLIAM J. MoOULLUeH, F. J.v EsoHENB URG.

